Reviews of both:
http://www.bit-tech.net/hardware/mot...-gd65-review/1
http://www.guru3d.com/article/asus-p8z68-v-pro-review/
I tend to agree with KieX, I would go with the Z68 board. Z68 has some nice features, including a great UEFI interface. Both boards are good overclockers, and the feature set of the Z68 is superior, so that gets my vote.